Added: Lobby server command "spectator" - will attempt to put the player in an available spectator slot

OpenRA.Game/Server/Server.cs

@@ -377,14 +377,24 @@ namespace OpenRA.Server
 				{ "race",
 					s => 
 					{	
-						GetClient(conn).Country = s;
+							GetClient(conn).Country = s;
+
 						SyncLobbyInfo();
 						return true;
 					}},	
 				{ "spectator",
 					s =>
 						{
-						// GetClient(conn).Slot = -1; /* observer */
+						var slotData = lobbyInfo.Slots.Where(ax => ax.Spectator && !lobbyInfo.Clients.Any(l => l.Slot == ax.Index)).FirstOrDefault();
+						if (slotData == null)
+							return true;
+
+						var cl = GetClient(conn);
+						
+							cl.Slot = slotData.Index;
+
+							SyncClientToPlayerReference(cl, slotData.MapPlayer != null ? Map.Players[slotData.MapPlayer] : null);
+
 						SyncLobbyInfo();
 						return true;
 					}},